Here's what the fifth Fallout 3 DLC add-on, Mothership Zeta, looks like. I'm definitely digging the '50s flying saucer stylings and the alien abduction stuff.
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As you may know, this is the last DLC Bethesda has announced for the game, though at one time the same was true of Broken Steel, and then we got two more packs out of 'em. I asked VP Pete Hines if the same might happen again, and he responded thusly.
We have no others planned.
Sounds pretty definitive, though I invite you to join me in never saying never. If this one sells gangbusters, you never know what might happen. Do you? Huh? No, I didn't think so.
EDIT: I completely forgot to mention the Xbox and PC release date for this one: August 3. Go me! This one is 800 points ($10), like all the others before it.